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The heroine of this route is Rin Tohsaka. The player must complete the Fate scenario before being able to enter Unlimited Blade Works. Completing this route is required to access the final route: Heaven's Feel. Although it is possible to enter the Unlimited Blade Works route without having finished the Fate route by declining Tohsaka's offer of cooperation, entering the route this way leads to an unavoidable bad end.

Shortly after repelling Lancer, Saber prepares to attack Archer who approaches. However, Shirou uses his Command Spell to negate that action and ends up conversing with Rin. In the end, no alliance is made at the time. After introducing Shirou to the Holy Grail War rules from Kirei, Illyasviel von Einzbern attacks them with her Servant Berserker on their way home. Unlike in the Fate route, Archer briefly participates in the battle and his help proves to be vital in driving Berserker away. The next day, Shirou goes to school with Saber, introducing her to Taiga and Sakura.

The next day, when all other students and teachers leave the school, Rin starts her assault on Shirou, relentlessly pursuing him with the intent to kill him unless he surrenders Saber's Command Spells. She is interrupted at the last moment by the sudden appearance of Rider, who attacks a student. Shirou and Rin promptly team up to drive Rider away. Shirou catches a quick glimpse of Shinji as they do.

Shirou and Rin form a truce and begin searching for possible candidates for Rider's Master. That night, Shirou is urged to go to the Ryuudou Temple through the magic of Caster, who also wishes to take away his Command Spell. Archer interrupts and saves Shirou while Saber confronts Assassin. It is at this moment that Shirou starts to get even more irritated by Archer, who has looked down on his ideals. Archer then attacks Shirou, but is stopped by Saber and Assassin.

After that, Rin begins to have dreams about a hero who was betrayed by his ideals. Rin apologizes to Shirou for Archer's actions and tells him that she used a Command Spell to order Archer to never attack Shirou. During strategy planning, Rider activates Blood Fort Andromeda. However, when Shirou and Rin approach her, they find her already dead. The terrified Shinji runs off to the Kotomine Church, where Kirei grants him the use of Gilgamesh. In the meantime, Archer and Saber debate over how Rider was killed; while Saber claims she died in honor protecting her Master, Archer claims she was a weakling, once again creating a rift between him and the rest.

Rider's death makes Shirou suspect that there is another Master in the school, one other than Shinji. He suspects his friend Issei Ryuudou at first, but it turns out that the Master is their teacher Soichiro Kuzuki, who controls Caster. When Shirou and Rin ambush them, Kuzuki surprises them with his innate fighting abilities, enhanced by Caster's enchantment spells, which are able to cripple Saber. In order to make it easier to plan and strategize, Rin comes to stay at Shiro's house.

The next day, Rin takes Shirou on a date, bringing Saber along. On returning home, they find Caster holding Taiga Fujimura hostage. When Shirou tries to follow her demands, Caster releases Taiga and strikes Saber with the Rule Breaker, transferring Shirou's Command Spells to her. At Saber's urging, Shirou and Rin leave. With his Command Spells gone, Rin declares that she will fight Kuzuki and Caster with only Archer. However, Shirou insists on helping and follows them despite Rin's objections. Meanwhile, Caster tortures Saber in an effort to break her and make her submit completely. However, Saber's magic resistance proves to be an obstacle for Caster's Command Spell.

Shirou follows Rin and witnesses her confronting Kuzuki and Caster in the Kotomine Church, their new base of operation. To her shock, Archer suddenly betrays Rin and attacks her. Shirou saves her and confessed his feelings for her, and although she is reluctant and embarrassed, she eventually thanks him and accepts his help again. With Archer gone, both decide to ask Ilya and Berserker for their help. Unfortunately, they arrive too late and find Shinji and Gilgamesh have gotten there first. Gilgamesh makes short work of Berserker, then rips Ilya's heart out. Both of them then leave the castle, leaving Shirou and Rin in despair until Lancer suddenly emerges and offers his help, which they accept.

They return to the Kotomine Church, where Lancer fights Archer again. Archer admits defeat and retreats into the church. Meanwhile, Shirou and Rin team up to fight Kuzuki and Caster, ending in a stalemate. Caster tries to turn the tables and use a spell to completely dominate Saber and send her against Shirou and Rin. But before she can, Archer arrives and attacks Kuzuki. Caster dies protecting Kuzuki, who Archer then kills. He reveals that he was only faking his loyalty to Caster in order to eliminate her, as well as use her Rule Breaker to remove his contract with Rin and allow him to do what he has planned since the beginning - kill Shirou. In the wake of this, Rin makes a new contract with Saber, thereby making her Saber's master. Archer then kidnaps Rin and takes her hostage to the Einzbern Castle, where Shinji attempts to sexually abuse her.

The next day, Shirou, Saber and Lancer head to the Einzbern Castle, whereupon Archer reveals that he is an alternate future Emiya Shirou, the hero who is betrayed by the ideals he fought for, and now he seeks to create a time paradox by killing his past self. He considers this an act of mercy, not wanting Shirou to see his ideals betray and crush him like the way they crushed Archer. While Shirou fights, Lancer goes to rescue Rin. Kirei suddenly appears and orders Lancer to kill her. However, Lancer demands that Kirei use his Command Spell for such an order, and Kirei does, ordering Lancer to kill himself instead. Rin is about to submit to her fate as Kirei approaches to kill her, when suddenly Lancer stabs Kirei in the back using Gae Bolg. Shinji, now believing he is free to do whatever he likes to Rin, is chased off by a just-revived Lancer. After setting Rin free, Lancer activates his Ansuz rune, burning the room as he dies.

Shirou faces off with Archer, finally convincing Archer that he is not taking the wrong path as he has no regrets about his decision, no matter what repercussions it may have in the future. With that, Archer is defeated. Gilgamesh then appears, attempting to kill Shirou because of his nature as a "Faker", but Archer pushes Shirou out of the path of Gilgamesh's attack, seemingly sacrificing himself He then retreats when the fire started by Lancer inflames the whole castle and destroys it. Gilgamesh catches up with Shinji and inserts Ilya's heart into his body, making him the new incarnation of the Holy Grail.

That night, Rin makes a contract with Shirou to give him mana so that he could battle Gilgamesh. Shirou, Rin and Saber reach Gilgamesh's new hideout, the Ryuudou Temple. Rin tries to pull Shinji out of the embodiment of the Grail while Shirou fights Gilgamesh and Saber is held back by Assassin. Shirou is able to take out Gilgamesh by using his own version of Unlimited Blade Works. However, Gilgamesh revives one last time to try and make him the new incarnation of the Holy Grail. Fortunately, Archer, who also appeared to help Rin at the same time, comes to Shirou's aid, finishing off Gilgamesh with an arrow to the head. Rin bids her Servant goodbye, as Archer tells her to take care of his younger self, hoping that her care of Shirou will change the future and grant his wish to save Shirou from his ideals. In the end, Rin finally sees Archer with a genuine smile, the same one as Shirou's.

It is noted that, in this route, Shirou and Rin develop feelings for each other as they grow closer as friends. This scenario also highlights Rin's tsundere qualities. Also Rin is the Winner of the 5th Grail War.

Resolutions: Two endings are available for this scenario.

The "Good" ending depicts an epilogue in which Rin, Shirou, and Saber live together at the Emiya household.

The "True" ending shows Rin planning to head off to the Clocktower after she graduates, with Shirou joining her as her apprentice. They are also officially in a romantic relationship in this ending. In the True Ending, Saber uses Excalibur to vanquish the Holy Grail and vanishes as a result, but she departs on a happy note.

Bad endings:

Sword and magic: On Day 12, if Shirou decides to appear before Caster and Kuzuki before Archer betrays Rin, Kuzuki uses a Command Spell to take control of the captured Saber's will in order to even the odds. As both Caster and Saber attack, Archer knows he cannot protect his Master, not even bothering to tell her to run. With no way to counter-attack, the screen fades out.

The start of Gilgamesh fighting Berserker is shown. Gilgamesh tests out the limits of God Hand, recognizing that he has to use his greatest treasures to damage Berserker. He tells Berserker to stop protecting Illya and fight him directly to have any chance of winning.

Illya's past is shown, haunted by a mental specter of Irisviel telling her of Kiritsugu's "misdeeds" and goading her to kill Shirou. She sees similar illusions in a homunculus disposal area, the homunculi describing their purpose and telling her that the family will give up completely should she fail. She later meets Leysritt and Sella for the first time, and they show her Berserker.

Gilgamesh seemingly finishes off Berserker while he is chained by Enkidu, but Berserker breaks free after Illya has passed and makes one final charge at a surprised Gilgamesh.

Episode 23

The wishes of humanity are shown to be converging and strengthening the Grail.

Gilgamesh explains to Shirou that going all out against him would mean it would be his own loss due to his pride.

The Lesser Grail begins to manifest as a humanoid Avenger. Rin uses a Command Spell to force Saber to destroy the Grail before Archer saves her and Shinji. Saber resists until they are safe, and Rin uses a third Command Spell to give Saber more magical energy.

Gilgamesh does not immediately draw Ea when he says that he needs to get serious after Shirou triumphs in their melee confrontation, instead pushing him back and attacking him with the full might of the Gate of Babylon. Shirou successfully manages to deflect every sword launched at him, even using Rho Aias to block an all-out attack from every direction, before closing the distance and chopping off Gilgamesh's arm right after he grabs Ea.

Shirou manages to land a final blow on Gilgamesh and runs out of magical energy naturally. Gilgamesh admits that Shirou was victorious in their battle due to having forced him to become serious, and prepares to finish off Shirou before the Grail swallows him.

Episode 25

Shirou and Rin shown to be studying at the Clock Tower. Rin and Luviagelita Edelfelt briefly scuffle in a self-defense class after Luvia flirted with Shirou.

Shirou and Rin go to Glastonbury to visit the grave of Saber so that Shirou can give her a proper goodbye.

Shirou is offered to be officially accepted into the Clock Tower, but has differing thoughts about his path as an ally of justice. He turns down the offer, briefly meeting Lord El-Melloi II, who says Shirou's dream is idiotic, but honorable. Rin decides to follow him in his travels though she remain affiliated with the Clock Tower.

At the very end, an adult Shirou is shown traveling the desert that Archer visited in his past after contracting with the world.